Malicious PDF — malware analysis report

Static analysis result for SHA-256 4459918709135035…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 23:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58ded6062994d1f2885a3c67ca964742 SHA-1: 2abc0207b6c660250c59237cef996945fcd34174 SHA-256: 4459918709135035c3ded61583dafcb595beca71f3e87c80fc5f11fe6beaa200
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lengthening-sldf.com/userfiles/file/36885110558.pdf In PDF document text
    • https://austarpharma.austarchina.com/upload/files/bagutatiralibovoxej.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/11318485154.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/73651392323.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/86044595129.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/dusibibotizunisurexozu.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/jirosolomawe.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/baravifufe.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b706c377c1f16ed78a50f66aff14a58c/75718079274.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/99812608775.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613b6d25e1734---zetimizowogasek.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/wezoxano.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322a7866e39---jibudesu.pdfIn PDF document text
    • https://0900107678.com/upload/file/51579628862.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/kidole.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/zenulafubegez.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/6024183568.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/xipanevarupewajiw.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/zogezumazar.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/42183615678.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3de521252af088c037e37cb69c69ebf4/92890781744.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/xevakasiruvekegukugiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=commando+1+full+movie+downloadPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/jojulexime.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 17256 bytes
SHA-256: 74725a63003835e579bf0679acaceab9e715e084313dcfa54971cbbb81432ae2
font_01_sfnt_off0001134b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134B 10484 bytes
SHA-256: cdb21d85e485f6189a69a28d57ab538948cf59c43b2485e11104a081dd82d3c9
font_02_sfnt_off00012b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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